Exam 1 Flashcards
When sign of velocity=sign of acceleration
speed is increasing
When sign of velocity is opposite sign of acceleration
speed is decreasing
gravity as acceleration is always
negative
object dropped
initial velocity =0
For free fall going upward is
positive
object thrown downward
initial velocity is negative
object thrown upward
initial velocity is positive
instantaneous velocity at max height=0
motion may be symmetrical:
- t up =t down
- V final = -V initial
motion may be asymmetrical
- break down motion into various parts
vector subtraction
add negative of the subtracted vector
multiplying by a vector
increases magnitude
direction does not change
dividing by a vector
increases magnitude
reverses direction
Rules of Projectile motion
x and y motions are completely independent
x direction is uniform motion: a(x)=0
y direction is free fall: a(y)=g
initial velocity can be broken down into its components
complementary values have
the same range
maximum range occurs at
45 degrees
when finding the velocity of the projectile you must be careful of
the angle’s quadrant
nano
10 ^-9
micro
10^-6
mili
10^-3
kilo
10^3
mega
10 ^6
giga
10^9
when converting between prefixes when getting smaller you
multiply
when converting between prefixes and getting larger you..
divide
Sig Fig Rule 1
all non-zero digits are know
sig fig rule 2
zeros are significant when:
- between two non-zero
- after decimal point and another sig fig
NO trailing zeros
